Two-Wire interface for digital microphones

Wouter Groothedde (Inventor), Eric A.M. Klumperink (Inventor), Bram Nauta (Inventor), Rudolphe Gustave Hubertus Eschauzier (Inventor), Nico van Rijn (Inventor)

    Research output: Patent

    158 Downloads (Pure)


    A two-wire interface for a digital microphone circuit includes a power line and a ground line. The interface utilizes the ground line as a "voltage active line" to transmit both clock and data signals between the digital microphone circuit and a receiving circuit. The digital microphone circuit detects the clock signal on the voltage active line and uses the detected clock signal to operate an ADC to provide digital data. The digital data is used to selectively drive current back to the receiving circuit over the voltage active line. The receiving circuit detects the transmitted data by monitoring the voltage associated with a line termination. The impedance associated with the line termination is switched by the receiver circuit to modulate the clock signal on the voltage active line.
    Original languageUndefined
    Patent numberUS6853733 B1
    Publication statusPublished - 8 Feb 2005


    • IR-102618
    • EWI-27482

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